Sync rustc_codegen_cranelift #112671
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Sync rustc_codegen_cranelift #112671
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Currently a `{D,Subd}iagnosticMessage` can be created from any type that
impls `Into<String>`. That includes `&str`, `String`, and `Cow<'static,
str>`, which are reasonable. It also includes `&String`, which is pretty
weird, and results in many places making unnecessary allocations for
patterns like this:
```
self.fatal(&format!(...))
```
This creates a string with `format!`, takes a reference, passes the
reference to `fatal`, which does an `into()`, which clones the
reference, doing a second allocation. Two allocations for a single
string, bleh.
This commit changes the `From` impls so that you can only create a
`{D,Subd}iagnosticMessage` from `&str`, `String`, or `Cow<'static,
str>`. This requires changing all the places that currently create one
from a `&String`. Most of these are of the `&format!(...)` form
described above; each one removes an unnecessary static `&`, plus an
allocation when executed. There are also a few places where the existing
use of `&String` was more reasonable; these now just use `clone()` at
the call site.
As well as making the code nicer and more efficient, this is a step
towards possibly using `Cow<'static, str>` in
`{D,Subd}iagnosticMessage::{Str,Eager}`. That would require changing
the `From<&'a str>` impls to `From<&'static str>`, which is doable, but
I'm not yet sure if it's worthwhile.
This makes it possible to use liballoc/libstd in combination with `--emit obj` if you use `#[global_allocator]`. Making it work for the default libstd allocator would require weak functions, which are not well supported on all systems.
You will need to add the following as replacement for the old __rust_*
definitions when not using the alloc shim.
#[no_mangle]
static __rust_no_alloc_shim_is_unstable: u8 = 0;
This makes it easier for ./x.py to vendor all dependencies
Ignore `core`, `alloc` and `test` tests that require unwinding on `-C panic=abort` Some of the tests for `core` and `alloc` require unwinding through their use of `catch_unwind`. These tests fail when testing using `-C panic=abort` (in my case through a target without unwinding support, and `-Z panic-abort-tests`), while they should be ignored as they don't indicate a failure. This PR marks all of these tests with this attribute: ```rust #[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")] ``` I'm not aware of a way to test this on rust-lang/rust's CI, as we don't test any target with `-C panic=abort`, but I tested this locally on a Ferrocene target and it does indeed make the test suite pass.
Support testing of cg_clif in rust's CI
rustbot
added
A-testsuite
|
@bors r+ p=1 |
bors
added
S-waiting-on-bors
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☀️ Test successful - checks-actions |
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Finished benchmarking commit (114fb86): comparison URL. Overall result: no relevant changes - no action needed@rustbot label: -perf-regression Instruction countThis benchmark run did not return any relevant results for this metric. Max RSS (memory usage)ResultsThis is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.
CyclesResultsThis is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.
Binary sizeThis benchmark run did not return any relevant results for this metric. Bootstrap: 648.056s -> 648.365s (0.05%) |
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The main highlights this time are a cranelift update, some x86 vendor intrinsic implementations and preparations for testing cg_clif in CI here.
r? @ghost
@rustbot label +A-codegen +A-cranelift +T-compiler